/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.sql.parser.hive.ddl;

import org.apache.flink.sql.parser.ddl.SqlTableOption;
import org.apache.flink.sql.parser.hive.ddl.SqlCreateHiveTable.HiveTableRowFormat;
import org.apache.flink.sql.parser.hive.impl.ParseException;

import org.apache.calcite.sql.SqlCharStringLiteral;
import org.apache.calcite.sql.SqlIdentifier;
import org.apache.calcite.sql.SqlNode;
import org.apache.calcite.sql.SqlNodeList;
import org.apache.calcite.sql.SqlWriter;
import org.apache.calcite.sql.parser.SqlParserPos;

import static org.apache.flink.sql.parser.hive.ddl.SqlAlterHiveTable.AlterTableOp.CHANGE_SERDE_PROPS;

/**
 * ALTER TABLE DDL to change a Hive table's SerDe.
 */
public class SqlAlterHiveTableSerDe extends SqlAlterHiveTable {

	private final SqlCharStringLiteral serdeLib;
	private final SqlNodeList origSerDeProps;

	public SqlAlterHiveTableSerDe(SqlParserPos pos, SqlIdentifier tableName, SqlNodeList partitionSpec,
			SqlNodeList propertyList, SqlCharStringLiteral serdeLib) throws ParseException {
		super(CHANGE_SERDE_PROPS, pos, tableName, partitionSpec, HiveDDLUtils.checkReservedTableProperties(propertyList));
		// remove the last property which is the ALTER_TABLE_OP
		origSerDeProps = new SqlNodeList(propertyList.getList().subList(0, propertyList.size() - 1),
				propertyList.getParserPosition());
		appendPrefix(getPropertyList());
		if (serdeLib != null) {
			propertyList.add(HiveDDLUtils.toTableOption(
					HiveTableRowFormat.SERDE_LIB_CLASS_NAME, serdeLib, serdeLib.getParserPosition()));
		}
		this.serdeLib = serdeLib;
	}

	@Override
	public void unparse(SqlWriter writer, int leftPrec, int rightPrec) {
		super.unparse(writer, leftPrec, rightPrec);
		writer.keyword("SET");
		if (serdeLib != null) {
			writer.keyword("SERDE");
			serdeLib.unparse(writer, leftPrec, rightPrec);
		}
		if (origSerDeProps != null && origSerDeProps.size() > 0) {
			if (serdeLib == null) {
				writer.keyword("SERDEPROPERTIES");
			} else {
				writer.keyword("WITH SERDEPROPERTIES");
			}
			SqlWriter.Frame withFrame = writer.startList("(", ")");
			for (SqlNode property : origSerDeProps) {
				printIndent(writer);
				property.unparse(writer, leftPrec, rightPrec);
			}
			writer.newlineAndIndent();
			writer.endList(withFrame);
		}
	}

	private static SqlNodeList appendPrefix(SqlNodeList propList) {
		if (propList != null) {
			for (int i = 0; i < propList.size(); i++) {
				SqlTableOption tableOption = (SqlTableOption) propList.get(i);
				if (!tableOption.getKeyString().equals(ALTER_TABLE_OP)) {
					String key = HiveTableRowFormat.SERDE_INFO_PROP_PREFIX + tableOption.getKeyString();
					tableOption = HiveDDLUtils.toTableOption(key, tableOption.getValue(), tableOption.getParserPosition());
					propList.set(i, tableOption);
				}
			}
		}
		return propList;
	}
}
